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<head><title>example 6</title></head>
<body>
with SetNullBlock you can set the default value to put if the block doesn't get parsed.<br>
the default is to wipe it out, but you can set it up to put a custom string.<br>

<!-- BEGIN: block -->
	<br>{INTRO_TEXT}<br>
	<b>sub blocks begins here ==&gt; [</b>
	<!-- BEGIN: subblock1 -->
	<b>this is subblock1 _PARSED_</b>
	<!-- END: subblock1 -->
	<!-- BEGIN: subblock2 -->
	<b>this is subblock2 _PARSED_</b>
	<!-- END: subblock2 -->
	<b>] &lt;== sub blocks ends here.</b><br>
<!-- END: block -->
<br><br>..got it? :) 
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</html>
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